RAKHYM, A. B. et al. Chamotte clay sorbent for the extraction of lead and cadmium ions from aqueous solutions. International Journal of Biology and Chemistry, [S.l.], v. 12, n. 2, p. 129-134, jan. 2020. ISSN 2409-370X. Available at: <https://ijbch.kaznu.kz/index.php/kaznu/article/view/397>. Date accessed: 02 july 2020. doi: https://doi.org/10.26577/ijbch-2019-i2-17.